Hi,
I have had the SD3 now since May. In most ways it has surpassed my expectations. Its sounds are so much better than even the demos, as the demos can't do it justice. I have it with the vocalizer. It's a lot of fun to harmonize with yourself. I use it with a Roland SA-300 amplifier (2x75w treble and 1x200w subwoofer). Controls are laid out very well. It does have one drawback... it does not have a USB port, so if you want to transfer midi files from SD3 to your computer, you either need music software and a midi to USB connector, or if your computer has a serial port you can use Ketron's serial cable and Ketron's file transfer software available on the Ketron Italy site. Also, the FR-7 footswitches won't control the Ketron functions (not a big deal) but, of course, Ketrons footswitches work fine.